Unfolding behavior of self-folded boron nitride nanosheets inducing ductility of cementitious composites

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

1 Scopus Citations
View graph of relations

Detail(s)

Original languageEnglish
Article number153818
Journal / PublicationApplied Surface Science
Volume599
Online published30 May 2022
Publication statusPublished - 15 Oct 2022

Abstract

A classical molecular dynamics simulation is adopted to study unfolding behavior of self-folded boron nitride nanosheets (BNNSs) in the cementitious composite. The simulation results show that unfoldings of the self-folded BNNSs initiate at the interface between the interlayers of the self-folded BNNSs because this interface is weaker than the BNNS-tobermorite interface under individual tensile and shear deformation. The interfacial microstructure shows that the ends of the self-folded BNNSs are embedded into the rugged surfaces of tobermorite, which exhibits a mechanical interlocking effect on the BNNSs-tobermorite interface. Furthermore, the existence of the hydrogen bonds at the BNNS-tobermorite interface yield a robust interfacial interaction between BNNSs and tobermorite. The critical peeling forces required to peel the adhesion between BNNS and tobermorite and between interlayers of self-folded BNNSs are obtained from a continuum model, which gives insights into the unfolding initiation of the self-folded BNNSs. The progressive peeling at the BNNS-tobermorite interface allows the self-folded BNNSs to maintain mechanical reinforcement in tobermorite under a large deformation at the atomistic scale. The atomistic scale reinforcement of the self-folded BNNSs in the deformation capacity and mechanical properties of cementitious composites significantly improves the ductility of cementitious composites.

Research Area(s)

  • Ductility, Interface, Molecular dynamics simulation, Self-folded boron nitride nanosheets, Unfolding behavior